Senior Backend Engineer (B2B Contract)

Are you seeking a flexible remote work environment as a PHP developer? Are you passionate about the product and eager to make an impact? Do you want to grow alongside a young and close-knit scale-up in the SaaS sector? If so, you might be the PHP Backend Developer we’re looking for at Optios.Optios is an ambitious company with over a decade of experience in the hairdressing and beauty sector. We have evolved from a start-up to a thriving scale-up, actively expanding across various countries and markets. As we continue to grow, we are in need of an experienced PHP developer to join our team.Job ResponsibilitiesYou will contribute to our in-house software platform built with PHP and Symfony, developing new features.You will receive customer feedback and ensure that clients can utilize the software to its fullest potential.In meetings, you will discuss potential improvements for the platform and communicate the progress of the software to the rest of the team alongside your fellow developers.

Role Overview monks is looking for a PHP Backend Developer to help build and maintain the backend systems behind our digital projects. This position is based in Hilversum. What You Will Do Design, implement, and maintain backend solutions using PHP Work closely with front-end developers, product managers, and clients to deliver reliable applications Contribute to system architecture improvements and ongoing code quality What We Look For Strong experience with PHP development Focus on clean code and established best practices Interest in collaborating across teams and with clients If you are interested in building high-quality backend systems and enjoy working with others to solve technical challenges, monks would like to connect.

Join Deliverect, a pioneering force in commerce, where our API-first platform is transforming the food and retail industries. We provide businesses with a connected suite of solutions that simplifies operations and enhances revenue streams. Be part of a mission that empowers enterprises to sell seamlessly and deliver effortlessly in a dynamic global market.Department Focus:The Product Department at Deliverect is leading the digital ordering revolution, striving to deliver innovative solutions to the global marketplace. Our talented team of engineers, designers, and product managers are dedicated to creating tools that enable businesses to flourish in an ever-evolving digital landscape, optimizing digital ordering for both delivery and on-premise services. We are committed to crafting user-friendly, reliable, and scalable technology that streamlines operations and elevates customer experiences, playing a crucial role in the success of businesses worldwide. Innovation is at the core of our department, driving every initiative we undertake.Your Impact:As a Senior Backend Developer at Deliverect, you will be instrumental in developing and maintaining our platform’s core services. You will be responsible for building and scaling backend systems that optimize order management and facilitate seamless integrations for our clients. Your contributions will directly influence the stability and performance of our platform, ensuring a dependable experience for thousands of restaurants globally.*This position is a full-time, hybrid role with flexible work arrangements, requiring 3 days in our Amersfoort office and 2 days of remote work.

Join our innovative team at dev2 as a Senior Backend Developer specializing in AdTech. In this role, you will be responsible for designing and implementing robust backend systems that drive our advertising technology solutions. You will work closely with cross-functional teams to ensure seamless integration and performance of applications.

How do you, as a Backend Developer, delight our customers?As a Backend Developer at Kaartje2go, you will play a crucial role in ensuring that our customers enjoy a seamless ordering experience. You will be a part of the Development team, collaborating with Front-end and DevOps colleagues to maintain an efficient ordering process and satisfied customers.We are looking for someone who is eager to stay updated on the latest web technologies, regardless of whether they pertain to Front-end, Backend, or systems. Your willingness to learn and continuously develop your skills is what truly matters.What does a day as a Backend Developer look like?“Whether working from home or in the office, we always start our day together as a team. After a brief meeting, I review the day's agenda. The exciting part is that it varies every day. Some days are filled with various small tasks, while others involve larger projects that can last a week. My work includes small updates, bug fixes, performance enhancements, and integrating new features into our REST API. No two days are alike, which keeps my job enjoyable and challenging.”What makes you unique as a Backend Developer?You are passionate about the IT world and see technological solutions in every problem. Additionally:You have a completed HBO or WO degree in a technical field.You are a PHP specialist or are eager to become one. You are familiar with various frameworks (Symfony) and are willing to learn new ones. Currently, we are working with Symfony 7.4 and PHP 8.5.You are open to satisfying your likely curiosity about Javascript by experimenting with it in various ways.You understand that development and operations go hand in hand. You thrive on continuous integration, delivery, and deployments, and the terminal doesn't intimidate you.About your team at Kaartje2goOur Development department is divided into four teams: Shop, Editor, Core, and JAM. These teams consist of twenty motivated Developers who ensure that the website runs smoothly. Alongside their shared passion for IT, they also share a love for craft beer. Every Friday, lunch starts with a döner or falafel sandwich from Baki’s in Zwolle’s city center, followed by Kink Radio filling the speakers, and a Friday afternoon gathering filled with jokes and dry humor.What we offer youOf course, we believe that Kaartje2go is the best workplace. To also...

Role overview jobgether seeks a Senior Backend Developer with advanced Node.js skills for its Netherlands team. This role focuses on building and maintaining server-side applications that support the company’s products and business objectives. What you will do Design and implement scalable backend systems using Node.js Collaborate with teams across disciplines to enhance both user experience and system performance Support the rollout of new features and contribute to projects aligned with business goals Requirements Extensive experience in backend development with Node.js Strong problem-solving skills for tackling technical challenges Ability to work well with others and communicate ideas clearly

About Us:Planner 5D serves as a global leader in home design, connecting over 100 million users across 230 territories—including two users from Antarctica each month! Our innovative platform streamlines the home renovation journey, transforming ideas into reality with our state-of-the-art software. You don’t have to be a professional designer to enhance your living or working space; we make it easy for everyone to customize their dream homes, making the design experience more accessible than ever here.Our cross-platform availability includes Web, iOS, Android, Windows, and MacOS, ensuring seamless synchronization for users. Planner 5D is more than just software; it’s a vibrant community of passionate, product-driven professionals from various backgrounds who collaborate across time zones, united by a common goal to revolutionize the home design industry.We are always on the lookout for like-minded talent who are eager to take ownership and drive innovation within our expanding suite of tools. Join us in shaping the future of home design.We are in search of an experienced PHP Developer to join our dynamic team. Beyond foundational PHP skills, we seek individuals with a robust understanding of software design principles. The perfect candidate will effectively apply these principles to create reliable, scalable, and maintainable software solutions.

jobgether seeks a Senior PHP Developer to join the Technology & AI Labs team in the Netherlands. The position centers on building and maintaining PHP applications that support projects involving artificial intelligence and advanced technology. Key responsibilities Design, develop, and maintain applications using PHP Collaborate with cross-functional teams to deliver technical solutions Contribute to projects that involve AI and advanced technologies Requirements Significant experience developing with PHP, ready to handle complex challenges Ability to adapt to shifting priorities Collaborative approach and an interest in technology innovation Location This role is based in the Netherlands.

Ben jij een enthousiaste Backend Developer die de uitdaging aangaat om meer dan 10 miljoen actieve leden van Social Deal te ondersteunen? In deze rol ben je verantwoordelijk voor het garanderen van een optimale gebruikerservaring op onze website.Wat ga je doen als Backend Developer?Je zorgt ervoor dat onze gebruikers altijd kunnen profiteren van de diensten die wij aanbieden.Als teamspeler ben je veelzijdig; je hebt je eigen specialisatie maar pakt ook andere taken op binnen het team.Je stelt prioriteiten voor je werk in overleg met teamleden en Product Owners.Je werkt aan het uitbreiden en verbeteren van verschillende codebases.Je presenteert demo's aan stakeholders, waaronder de directie.Je communiceert actief met andere divisies binnen de Development-afdeling.Met wie werk je samen?Je komt terecht in een hecht team van meer dan 50 collega's, bestaande uit ontwikkelaars, product owners, testers, UX/UI designers en stagiaires. We werken serieus, maar er is altijd ruimte voor een grapje. Regelmatig genieten we samen van een biertje en een borrel.

Join us as a Senior Backend Developer!Are you a skilled backend developer eager to make a significant impact in a rapidly growing and innovative organization? FinancialLease.nl is seeking a passionate Senior Backend Developer to strengthen our Digital Innovations team and contribute to building robust and scalable solutions!About UsAt FinancialLease.nl, we go beyond leasing; we create intelligent digital solutions that simplify complexity. Our Digital Innovations team plays a central role in developing scalable, secure, and user-friendly systems that support the entire organization. We work with a modern tech stack, including C#, ASP.NET Core, TypeScript, React, React Native, and Next.js.We believe in choosing the right tools for the right challenges and prioritize clean, maintainable, and scalable code over quick, temporary fixes. Our engineers are valued partners within the business, directly contributing to the success of our services.Your RoleAs a Senior Backend Developer, you will be responsible for the development and maintenance of our backend systems and APIs. You will collaborate closely with the engineering team to build new features, enhance performance, and ensure the quality of our codebase. This is a hands-on role where you will work across the entire backend stack and actively influence technical decisions.You will join a team that prioritizes quality and structure, striving for sustainable solutions that are well-founded from the ground up.

Deze rol is niet remote en vereist vloeiend Nederlands (C1/C2).Als Teamleider Backend ben jij de drijvende kracht achter de gebruikservaring van meer dan 10 miljoen actieve leden die onze website dagelijks gebruiken. Je bent verantwoordelijk voor het aansturen van ons Backend team en voor de applicatie zelf. Je speelt een cruciale rol in het ontwikkelingsproces en biedt ondersteuning aan je team. Je houdt een helder overzicht van de systemen waarmee je team werkt en fungeert als een onmisbare bron van kennis en advies voor je collega-backenders. In deze functie stuur je projecten aan, coördineert andere ontwikkelaars en rapporteert je regelmatig over de voortgang aan het management.Wat zijn jouw verantwoordelijkheden als Teamleider Backend?Je motiveert je team om hun doelen te behalen en biedt ondersteuning waar nodig.Je bevordert de professionele groei binnen het team.Je bent betrokken bij het wervingsproces en neemt deel aan sollicitatiegesprekken samen met onze recruiters.Je monitort en evalueert de effectiviteit van het team en vertaalt knelpunten naar verbeteringen.Je blijft op de hoogte van de nieuwste softwareontwikkelingen, met een specifieke focus op PHP.Je prioriteert backendwerk in overleg met je team en de Product Owners.Je werkt mee aan het uitbreiden en verbeteren van verschillende codebases.Je presenteert demo's aan stakeholders, waaronder de directie en andere afdelingen.Je communiceert met verschillende divisies binnen de ontwikkeling over het ontwerp en de functionaliteit van de website.Met wie ga je samenwerken?Je komt terecht in een hecht team van meer dan 50 collega's, bestaande uit developers, product owners, quality assurance-testers, DevOps Engineers, UX/UI designers en stagiairs. Er wordt serieus gewerkt, maar er is ook ruimte voor plezier en ontspanning, met regelmatig geplande borrels.

At Speakap, we are on a mission to revolutionize communication for frontline and deskless workers through our innovative mobile-first Employee Experience Platform. Our platform empowers over 600 clients and 400,000 users in diverse sectors such as retail, hospitality, and healthcare to stay connected, informed, and engaged directly from their smartphones, eliminating the need for traditional email and desktop communications.If you have a passion for crafting clean, scalable, and secure code and enjoy tackling challenges while bringing creative ideas to life, we invite you to join our dynamic team. Help us redefine the future of work and connectivity.What You Will DoYour main responsibility will be to develop and enhance our API, which serves as the backbone of our platform, facilitating communication between web frontends, mobile applications, and third-party services.Collaborate with cross-functional teams to implement new features and enhance existing ones.Ensure the security and performance of our services under all conditions.Engage in architectural discussions to influence technology choices and problem-solving strategies.What You’ll BringA Bachelor’s or Master’s degree along with over 5 years of experience in building scalable, high-performance, multi-tier software while adhering to SOLID principles and design patterns in an agile environment.A strong collaborative spirit, excellent problem-solving abilities, and a commitment to writing clean, maintainable code.Proficiency in PHP 8, ECMAScript 10+, TypeScript, modern frameworks (Symfony 6+ preferred), Docker, CI/CD, Git, and shell scripting.Experience with relational databases (MySQL, MariaDB), automated testing (PHPUnit, Behat), and performance monitoring with DataDog.Familiarity with AWS services (S3, SQS, Lambda, etc.), Linux environments, and network protocols; knowledge of Elasticsearch, Java (8/9), Redis, Lua, NGINX, or OAuth 2 is a plus.A passion for automation, ensuring thorough test coverage, and optimizing repetitive tasks for efficiency.What We OfferAt Speakap, we are more than just a workplace; we are a supportive team that values your growth, ideas, and well-being.

Are you eager to join a dynamic team where your coding skills can have a profound impact? If you are a dedicated developer who thrives on solving intricate technical problems, we invite you to be part of our Core team and help us innovate the Momo platform! As a Senior Backend Developer, you will be crucial in the design, development, and maintenance of our essential backend services utilizing Node.js and TypeScript. Your expertise in Domain-Driven Design (DDD) will empower you to craft robust and scalable systems. Additionally, you will mentor junior developers and advocate for best practices within the team, fostering an environment of growth and collaboration.Who is Momo Medical?Momo Medical is an ambitious and rapidly expanding scale-up based in Delft, tackling one of society's most pressing challenges: the future of (elderly) care. Over the next decade, the demand for care is set to double, coinciding with a 30% retirement rate among the current workforce. Our innovative solutions aim to alleviate the pressure on caregivers while enhancing the quality of care, thereby improving the lives of nursing home residents and increasing job satisfaction among caregivers.Key Benefits of the Position Access to a modern tech stack and a laptop of your choice. Opportunities for contribution, learning, and professional growth. Collaborate with cross-functional teams to deliver high-quality software. Enjoy a hybrid work model, with at least 4 days a week in our Delft office, working alongside a multidisciplinary team committed to excellence. Our technology stack includes Node.js, TypeScript, and AWS cloud services.Your ResponsibilitiesIn this role, you will design and develop high-performance backend services using Node.js and TypeScript, ensuring that the Momo App receives timely notifications and real-time data from various sensors.Implement Domain-Driven Design principles to create maintainable and scalable architectures.Mentor junior developers and promote best practices within the team.Collaborate with cross-functional teams to ensure high-quality software delivery.

Are you the experienced developer we are looking for?As a Senior Back-end PHP Developer, you will take charge of developing and maintaining our custom solutions. Your role involves designing, developing, and testing new features while enhancing existing solutions.Who are we?Toelevering Online is rapidly expanding and aims to provide customers with tailor-made windows, doors, and sliding doors. While traditional processes can take two to three months for custom deliveries, we can achieve this in as little as five working days. We are committed to further reducing this delivery time.How do we achieve this? By optimizing the (online) ordering process, making factories more efficient, configuring systems intelligently, and listening attentively to our customers. This leads to lower costs, improved service, and greater job satisfaction, allowing everyone to excel in their strengths.Toelevering Online is ambitious and strives for significant growth each year. Our goal: to become a market leader, both in the Netherlands and internationally. We are a passionate team of over 60 colleagues. Our culture is personal, driven, and focused on progress – for both the organization and its people.What will you do?As a Back-end PHP Developer, you will be part of our SCRUM team responsible for our e-commerce platform. Your daily tasks will include:Developing new features for our webshop using PHP Laravel.Occasionally working on front-end tasks (React / Next.js).Improving existing functionalities and optimizing performance.Collaborating with other Developers, a Product Owner, and a Scrum Master.Contributing to code reviews and technical discussions.Keeping your knowledge up-to-date in the field of modern back-end development.You will work with cutting-edge technologies and have the opportunity to help build a platform that is changing the market.

Join Our Team as a Senior Backend Developer (C#)Located in the vibrant campus of the Technical University of Eindhoven, we at wolfpackit are looking for a seasoned C#/.NET developer who is passionate about technology and making a significant impact. In this role, you will develop software solutions that truly make a difference in sectors like Healthcare, Education, and Technology while also taking on a mentoring role within a close-knit team.Your Role:As a Senior Backend Developer, you will be part of a cross-functional Scrum team, collaborating with other developers, Product Owners, and UX Designers. You will deliver high-quality backend solutions and play a crucial role in technical decision-making and guiding junior colleagues.Key Responsibilities:Take technical ownership of backend projects from architecture to delivery.Write clean, maintainable, and tested code in C#/.NET.Collaborate closely with Tech Leads, Product Owners, and UX Designers to define features and technical direction.Mentor junior developers through Pair Programming and Code Reviews.Contribute to architectural decisions, project setups, QA strategies, etc.Engage directly with clients to understand their needs and deliver tailored solutions.Support the Tech Lead in implementing best practices in Git workflows, CI/CD pipelines, and quality assurance.What You’ll Share With Your Friends:“I work in a multidisciplinary team developing custom software for a variety of clients. As a Senior Developer, I engage from the outset: I discuss project direction with the Product Owner, Tech Lead, and UX Designer. While coding is a significant part of my role, I also find great satisfaction in Pair Programming and mentoring my teammates. When someone faces challenges, they often turn to me for advice – I enjoy collaborating to overcome hurdles and ensure quality.”

Join VWE Automotive as a Senior Backend Developer in Heerhugowaard, working in a hybrid model with 32 to 38 hours per week, earning between €5,000 and €6,800 monthly.In this pivotal role, you will be instrumental in designing and developing our software solutions. You will blend strong technical vision with hands-on coding, contribute actively to architectural decisions, development standards, and the ongoing evolution of our platforms.VWE Automotive empowers businesses in the mobility sector with intelligent data and software solutions, assisting automotive companies, importers, and governments by making vehicle data accessible and automating processes. Our team of over 150 colleagues is dedicated to creating innovative products that make a significant impact in the automotive industry.Your Impact as a Senior DeveloperAre you an experienced developer who enjoys diving into software architecture while also contributing to development? This position allows you to leverage your technical expertise!You will work on advanced applications for leading players in the automotive sector, combining content development with guiding and maintaining our software architecture. Enjoy a balanced work-life with the flexibility of working from home and in our Heerhugowaard office.Your responsibilities include:Developing and maintaining backend software for our applications.Identifying, developing, and implementing technical improvements and development standards.Contributing to software architecture and making informed technical decisions.Reviewing solutions for completeness, scalability, and feasibility.Collaborating intensively with developers, product owners, and managers.What We OfferA gross salary ranging from €5,000 to €6,500 per month, based on your knowledge and experience.A full-time position of 38 hours per week.The possibility to work from home.A budget to set up your home office effectively.A laptop for your work.26 vacation days plus the option to purchase additional days.Travel expense reimbursement.A pleasant workplace in our modern office, easily accessible via public transport and car, just a five-minute walk from the station.

At Staxxer, we simplify complex European VAT, compliance, and accounting for e-commerce businesses.We develop software that fully automates OSS 2.0, European VAT, EPR, and accounting. What feels like a one-click solution for our clients is powered by a robust, scalable system that processes millions of transactions accurately across borders. Our focus is on building high-volume, data-driven backends where performance, reliability, and simplicity are paramount. We translate intricate regulations into solid logic that is correct, scalable, and efficient.Since 2021, over 1,500 European e-commerce sellers have relied on our systems daily. We are experiencing rapid growth, developing more in-house, and automating wherever possible. Consequently, we are looking for a Senior Backend Developer who enjoys building large systems, making informed decisions, and simplifying complexity into logical, maintainable structures.

About ClickHouseFeatured in the prestigious 2025 Forbes Cloud 100 list, ClickHouse stands out as a pioneering and rapidly expanding private cloud enterprise. With a diverse clientele of over 3,000 and an Annual Recurring Revenue (ARR) growth exceeding 250% year-over-year, ClickHouse is a leader in real-time analytics, data warehousing, observability, and AI workloads.The company’s remarkable growth trajectory was recently affirmed by a $400 million Series D financing round. In the last quarter alone, major clients such as Capital One, Lovable, Decagon, Polymarket, and Airwallex have adopted or expanded their use of our platform. They join a robust roster of AI trailblazers and globally recognized brands like Meta, Cursor, Sony, and Tesla.We are dedicated to transforming the data utilization landscape for enterprises. Join us on this exciting journey!Be a part of our mission to revolutionize Observability for Developers! We are redefining how engineers monitor, debug, and scale production applications with HyperDX, now integrated within ClickHouse. HyperDX is an open-source platform that seamlessly converts telemetry data into actionable insights. Picture an ecosystem where logs, metrics, traces, and session replays converge to rapidly identify root causes. If you've ever been awakened at 2 AM, frustrated by Grafana, Datadog, or Elastic for not providing the answers you need, you will understand the challenge we are addressing. Now, you have the opportunity to help us tackle this issue.We are seeking a Senior Backend Engineer to assist in building a petabyte-scale, high-performance observability platform with a strong emphasis on creating an exceptional developer experience (the DX in HyperDX).

Jobgether is seeking a Senior Backend Developer with strong Node.js skills for a partner company. This position is based in the Netherlands and supports remote work arrangements. Role overview This role centers on developing and maintaining large-scale digital financial products for users around the world. The work involves enhancing the core platform architecture, optimizing API performance, and building backend services that are secure, scalable, and highly available. Ensuring infrastructure reliability and resilience is a key part of the job. Key responsibilities Develop and maintain backend systems for digital financial products serving a global audience Improve platform architecture and API performance Build secure, scalable, and reliable backend services Lead new product development and contribute to technical innovation Work closely with engineers across regions in a remote-first environment Address complex challenges in real-time systems, microservices, and distributed applications Requirements Significant experience as a backend developer with advanced Node.js knowledge Proven ability to design and build secure, scalable services Comfort working in distributed, remote teams Strong problem-solving skills, especially in real-time and microservices architectures Work culture The company offers a remote-first culture, providing flexibility and autonomy. Team members collaborate across time zones and value ownership as they create products with a global impact.